Measuring and modelling energy partitioning in canopies of varying complexity using MAESPA model
Evapotranspiration and energy partitioning are complex to estimate because they result from the interaction of many different processes, especially in multi-species and multi-strata ecosystems. We used MAESPA model, a mechanistic, 3D model of coupled radiative transfer, photosynthesis, and balances of energy and water, to simulate the partitioning of energy and evapotranspiration in homogeneous tree plantations, as well as in heterogeneous multi-species, multi-strata agroforests with diverse spatial scales and management schemes. The MAESPA model was modified to add (1) calculation of foliage surface water evaporation at the voxel scale; (2) computation of an average within-canopy air temperature and vapour pressure; and (3) use of (1) and (2) in iterative calculations of soil and leaf temperatures to close ecosystem-level energy balances. We tested MAESPA model simulations on a simple monospecific Eucalyptus stand in Brazil, and also in two complex, heterogeneous Coffea agroforests in Costa Rica. MAESPA satisfactorily simulated the daily and seasonal dynamics of net radiation (RMSE=29.6 and 28.4Wm−²; R²=0.99 and 0.99 for Eucalyptus and Coffea sites respectively) and its partitioning between latent-(RMSE=68.1 and 37.2Wm−²; R²=0.87 and 0.85) and sensible-energy (RMSE=54.6 and 45.8Wm−²; R²=0.57 and 0.88) over a one-year simulation at half-hourly time-step.
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Texto biblioteca |
| Language: | eng |
| Subjects: | Sistemas agroforestales, Cafetal, Eucalyptus, Evapotranspiración, Ordenación forestal, |
| Online Access: | https://www.sciencedirect.com/science/article/pii/S016819231830042X |
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| Summary: | Evapotranspiration and energy partitioning are complex to estimate because they result from the interaction of many different processes, especially in multi-species and multi-strata ecosystems. We used MAESPA model, a mechanistic, 3D model of coupled radiative transfer, photosynthesis, and balances of energy and water, to simulate the partitioning of energy and evapotranspiration in homogeneous tree plantations, as well as in heterogeneous multi-species, multi-strata agroforests with diverse spatial scales and management schemes. The MAESPA model was modified to add (1) calculation of foliage surface water evaporation at the voxel scale; (2) computation of an average within-canopy air temperature and vapour pressure; and (3) use of (1) and (2) in iterative calculations of soil and leaf temperatures to close ecosystem-level energy balances. We tested MAESPA model simulations on a simple monospecific Eucalyptus stand in Brazil, and also in two complex, heterogeneous Coffea agroforests in Costa Rica. MAESPA satisfactorily simulated the daily and seasonal dynamics of net radiation (RMSE=29.6 and 28.4Wm−²; R²=0.99 and 0.99 for Eucalyptus and Coffea sites respectively) and its partitioning between latent-(RMSE=68.1 and 37.2Wm−²; R²=0.87 and 0.85) and sensible-energy (RMSE=54.6 and 45.8Wm−²; R²=0.57 and 0.88) over a one-year simulation at half-hourly time-step. |
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